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https://www.readbyqxmd.com/read/29138303/cxc-chemokines-exhibit-bactericidal-activity-against-multidrug-resistant-gram-negative-pathogens
#1
Matthew A Crawford, Debra J Fisher, Lisa M Leung, Sara Lomonaco, Christine Lascols, Antonio Cannatelli, Tommaso Giani, Gian Maria Rossolini, Yohei Doi, David R Goodlett, Marc W Allard, Shashi K Sharma, Erum Khan, Robert K Ernst, Molly A Hughes
The continued rise and spread of antimicrobial resistance among bacterial pathogens pose a serious challenge to global health. Countering antimicrobial-resistant pathogens requires a multifaceted effort that includes the discovery of novel therapeutic approaches. Here, we establish the capacity of the human CXC chemokines CXCL9 and CXCL10 to kill multidrug-resistant Gram-negative bacteria, including New Delhi metallo-beta-lactamase-1-producing Klebsiella pneumoniae and colistin-resistant members of the family Enterobacteriaceae that harbor the mobile colistin resistance protein MCR-1 and thus possess phosphoethanolamine-modified lipid A...
November 14, 2017: MBio
https://www.readbyqxmd.com/read/29106538/origin-of-the-plasmid-mediated-fosfomycin-resistance-gene-fosa3
#2
Ryota Ito, Marissa P Pacey, Roberta T Mettus, Nicolas Sluis-Cremer, Yohei Doi
Background: fosA3 is the most commonly reported plasmid-mediated fosfomycin resistance gene among Enterobacteriaceae. Objectives: To identify the origin of fosA3. Methods: The chromosome of Kluyvera georgiana clinical strain YDC799 was fully sequenced with single-molecule real-time sequencing. Comparative genetic analysis was performed for K. georgiana YDC799, K. georgiana type strain ATCC 51603 and representative fosA3-carrying plasmids. fosA genes were cloned in Escherichia coli to confirm function...
November 2, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29093108/frequency-and-mechanisms-of-spontaneous-fosfomycin-non-susceptibility-observed-upon-disk-diffusion-testing-of-escherichia-coli
#3
Aaron Lucas, Ryota Ito, Mustapha M Mustapha, Christi L McElheny, Roberta Mettus, Sarah L Bowler, Serena F Kantz, Marissa P Pacey, A William Pasculle, Vaughn S Cooper, Yohei Doi
Fosfomycin maintains activity against most Escherichia coli clinical isolates, but growth of E. coli colonies within the zone of inhibition around the fosfomycin disk is occasionally observed upon susceptibility testing. We aimed to estimate the frequency of such non-susceptible inner colony mutants and identify the underlying resistance mechanisms. Disk diffusion testing of fosfomycin was performed on 649 multidrug-resistant E. coli clinical isolates collected between 2011 and 2015. For those producing inner colonies inside the susceptible range, the parental strains and their representative inner colony mutants were subjected to MIC testing, whole genome sequencing, qRT-PCR, and carbohydrate utilization studies...
November 1, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29048285/high-level-fosfomycin-resistance-in-vancomycin-resistant-enterococcus-faecium
#4
Yan Guo, Adam D Tomich, Christi L McElheny, Vaughn S Cooper, Amelia Tait-Kamradt, Minggui Wang, Fupin Hu, Louis B Rice, Nicolas Sluis-Cremer, Yohei Doi
Of 890 vancomycin-resistant Enterococcus faecium isolates obtained by rectal screening from patients in Pittsburgh, Pennsylvania, USA, 4 had MICs >1,024 μg/mL for fosfomycin. These isolates had a Cys119Asp substitution in the active site of UDP-N-acetylglucosamine enolpyruvyl transferase. This substitution increased the fosfomycin MIC >4-fold and rendered this drug inactive in biochemical assays.
November 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29046472/-surgical-treatment-of-a-giant-olfactory-groove-schwannoma-a-case-report
#5
Takashi Fujii, Naoki Otani, Kazuma Doi, Masataka Miyama, Yohei Otsuka, Takashi Matsumoto, Toru Yoshiura, Satoru Takeuchi, Satoshi Tomura, Arata Tomiyama, Terushige Toyooka, Kojiro Wada, Kentaro Mori
Schwannomas originating from the olfactory nerve are extremely rare because the olfactory nerve does not normally contain Schwann cells. We describe a case of a giant schwannoma of the olfactory groove. A 73-year-old woman presented with anosmia persisting for 10 months. Head computed tomography(CT)for head trauma at another hospital demonstrated a tumor lesion located in the left frontal lobe and paranasal sinus. She had never suffered epilepsy, and past medical history and family history identified no indicators...
October 2017: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/29040419/high-rates-of-human-fecal-carriage-of-mcr-1-positive-multi-drug-resistant-enterobacteriaceae-isolates-emerge-in-china-in-association-with-successful-plasmid-families
#6
Lan-Lan Zhong, Hang T T Phan, Cong Shen, Karina Doris-Vihta, Anna E Sheppard, Xi Huang, Kun-Jiao Zeng, Hong-Yu Li, Xue-Fei Zhang, Sandip Patil, Derrick W Crook, A Sarah Walker, Yong Xing, Jia-Lin Lin, Lian-Qiang Feng, Yohei Doi, Yong Xia, Nicole Stoesser, Guo-Bao Tian
Objectives: mcr-1-mediated colistin resistance in Enterobacteriaceae is concerning, as colistin is used in treating multidrug-resistant Enterobacteriaceae infections. Rates of human mcr-1 gastrointestinal carriage have historically been low. We identified trends in human fecal mcr-1-positivity rates and colonization with mcr-1-positive+third-generation cephalosporin-resistant (3GC-R) Enterobacteriaceae in Guangzhou, China, and investigated the genetic contexts of mcr-1 in a subset of mcr-1-positive+3GC-R strains...
October 10, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29026866/a-prospective-observational-study-of-the-epidemiology-management-and-outcomes-of-skin-and-soft-tissue-infections-due-to-carbapenem-resistant-enterobacteriaceae
#7
Oryan Henig, Eric Cober, Sandra S Richter, Federico Perez, Robert A Salata, Robert C Kalayjian, Richard R Watkins, Steve Marshall, Susan D Rudin, T Nicholas Domitrovic, Andrea M Hujer, Kristine M Hujer, Yohei Doi, Scott Evans, Vance G Fowler, Robert A Bonomo, David van Duin, Keith S Kaye
BACKGROUND: This study was performed to characterize the epidemiology, management, and outcomes of skin and soft tissue infection (SSTI) and colonization due to carbapenem-resistant Enterobacteriaceae (CRE). METHODS: Patients from the Consortium on Resistance Against Carbapenem in Klebsiella and Other Enterobacteriaceae (CRACKLE-1) from December 24, 2011 to October 1, 2014 with wound cultures positive for CRE were included in the study. Predictors of surgical intervention were analyzed...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/29020404/colistin-vs-ceftazidime-avibactam-in-the-treatment-of-infections-due-to-carbapenem-resistant-enterobacteriaceae
#8
David van Duin, Judith J Lok, Michelle Earley, Eric Cober, Sandra S Richter, Federico Perez, Robert A Salata, Robert C Kalayjian, Richard R Watkins, Yohei Doi, Keith S Kaye, Vance G Fowler, David L Paterson, Robert A Bonomo, Scott Evans
Background: The efficacy of ceftazidime-avibactam - a cephalosporin-β-lactamase inhibitor combination with in vitro activity against Klebsiella pneumoniae carbapenemase (KPC)-producing carbapenem-resistant Enterobacteriaceae (CRE) - as compared to colistin remains unknown. Methods: Patients initially treated with either ceftazidime-avibactam or colistin for CRE infections were selected from the Consortium on resistance against carbapenems in Klebsiella and other Enterobacteriaceae (CRACKLE), a prospective, multicenter, observational study...
September 4, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29017262/ceftolozane-tazobactam-for-the-treatment-of-multidrug-resistant-pseudomonas-aeruginosa-infections-clinical-effectiveness-and-evolution-of-resistance
#9
Ghady Haidar, Nathan J Philips, Ryan K Shields, Daniel Snyder, Shaoji Cheng, Brian A Potoski, Yohei Doi, Binghua Hao, Ellen G Press, Vaughn S Cooper, Cornelius J Clancy, M Hong Nguyen
Background: Data on the use of ceftolozane-tazobactam and emergence of ceftolozane-tazobactam resistance during multidrug resistant (MDR)-Pseudomonas aeruginosa infections are limited. Methods: We performed a retrospective study of 21 patients treated with ceftolozane-tazobactam for MDR-P. aeruginosa infections. Whole genome sequencing and quantitative real-time polymerase chain reaction were performed on longitudinal isolates. Results: Median age was 58 years; 9 patients (43%) were transplant recipients...
July 1, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28993329/inhibition-of-fosfomycin-resistance-protein-fosa-by-phosphonoformate-foscarnet-in-multidrug-resistant-gram-negative-pathogens
#10
Ryota Ito, Adam D Tomich, Christi L McElheny, Roberta Mettus, Nicolas Sluis-Cremer, Yohei Doi
FosA proteins confer fosfomycin resistance in Gram-negative pathogens via glutathione-mediated modification of the antibiotic. In this study, we assessed whether inhibition of FosA by sodium phosphonoformate (PPF; foscarnet), a clinically approved antiviral agent, would reverse fosfomycin resistance in representative Gram-negative pathogens. The inhibitory activity of PPF against purified recombinant FosA from Escherichia coli (FosA3), Klebsiella pneumoniae (FosA(KP)), Enterobacter cloacae (FosA(EC)) and Pseudomonas aeruginosa (FosA(PA)) was determined by steady-state kinetics...
October 9, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28961916/structural-modification-of-lps-in-colistin-resistant-kpc-producing-klebsiella-pneumoniae
#11
Lisa M Leung, Vaughn S Cooper, David A Rasko, Qinglan Guo, Marissa P Pacey, Christi L McElheny, Roberta T Mettus, Sung Hwan Yoon, David R Goodlett, Robert K Ernst, Yohei Doi
Background: Colistin resistance in Klebsiella pneumoniae typically involves inactivation or mutations of chromosomal genes mgrB, pmrAB or phoPQ, but data regarding consequent modifications of LPS are limited. Objectives: To examine the sequences of chromosomal loci implicated in colistin resistance and the respective LPS-derived lipid A profiles using 11 pairs of colistin-susceptible and -resistant KPC-producing K. pneumoniae clinical strains. Methods: The strains were subjected to high-throughput sequencing with Illumina HiSeq...
November 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28960376/bayesian-noninferiority-test-for-2-binomial-probabilities-as-the-extension-of-fisher-exact-test
#12
Masaaki Doi, Fumihiro Takahashi, Yohei Kawasaki
Noninferiority trials have recently gained importance for the clinical trials of drugs and medical devices. In these trials, most statistical methods have been used from a frequentist perspective, and historical data have been used only for the specification of the noninferiority margin Δ>0. In contrast, Bayesian methods, which have been studied recently are advantageous in that they can use historical data to specify prior distributions and are expected to enable more efficient decision making than frequentist methods by borrowing information from historical trials...
September 27, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28958847/small-molecule-adjuvants-that-suppress-both-chromosomal-and-mcr-1-encoded-colistin-resistance-and-amplify-colistin-efficacy-in-polymyxin-susceptible-bacteria
#13
William T Barker, Sara E Martin, Courtney E Chandler, T Vu Nguyen, Tyler L Harris, Christopher Goodell, Roberta J Melander, Yohei Doi, Robert K Ernst, Christian Melander
Bacterial resistance to polymyxin antibiotics has taken on a new and more menacing form. Common are genomically-encoded resistance mechanisms to polymyxins, specifically colistin (polymyxin E), however, the plasmid-borne mobile colistin resistance-1 (mcr-1) gene has recently been identified and poses a new threat to global public health. Within six months of initial identification in Chinese swine in November 2015, the first human clinical isolation in the US was reported (Apr. 2016). Herein we report successful reversion of mcr-1-driven colistin resistance in Acinetobacter baumannii, Klebsiella pneumoniae, and Escherichia coli with adjuvants we previously reported as modulators of chromosomally-encoded colistin resistance...
October 15, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28919044/susceptibility-of-colistin-resistant-pathogens-to-predatory-bacteria
#14
Sonal Dharani, Dong Hyun Kim, Robert M Q Shanks, Yohei Doi, Daniel E Kadouri
The increase in multidrug-resistant Gram-negative bacterial infections has forced the reintroduction of antibiotics such as colistin. However, the spread of the plasmid-borne mcr-1 colistin resistance gene have moved us closer to an era of untreatable Gram-negative infections. To evaluate whether predatory bacteria could be used as a potential therapeutic to treat this upcoming threat, the ability of Bdellovibrio bacteriovorus and Micavibrio aeruginosavorus to prey on several clinically relevant mcr-1-positive, colistin-resistant isolates was evaluated...
September 15, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28874374/structure-and-dynamics-of-fosa-mediated-fosfomycin-resistance-in-klebsiella-pneumoniae-and-escherichia-coli
#15
Erik H Klontz, Adam D Tomich, Sebastian Günther, Justin A Lemkul, Daniel Deredge, Zach Silverstein, JoAnna F Shaw, Christi McElheny, Yohei Doi, Patrick L Wintrode, Alexander D MacKerell, Nicolas Sluis-Cremer, Eric J Sundberg
Fosfomycin exhibits broad-spectrum antibacterial activity and is being reevaluated for the treatment of extensively drug-resistant pathogens. Its activity in Gram-negative organisms, however, can be compromised by expression of FosA, a metal-dependent transferase that catalyzes the conjugation of glutathione to fosfomycin, rendering the antibiotic inactive. In this study, we solved the crystal structures of two of the most clinically relevant FosA enzymes: plasmid-encoded FosA3 from Escherichia coli and chromosomally encoded FosA from Klebsiella pneumoniae (FosA(KP))...
November 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28851843/widespread-fosfomycin-resistance-in-gram-negative-bacteria-attributable-to-the-chromosomal-fosa-gene
#16
Ryota Ito, Mustapha M Mustapha, Adam D Tomich, Jake D Callaghan, Christi L McElheny, Roberta T Mettus, Robert M Q Shanks, Nicolas Sluis-Cremer, Yohei Doi
Fosfomycin is a decades-old antibiotic which is being revisited because of its perceived activity against many extensively drug-resistant Gram-negative pathogens. FosA proteins are Mn(2+) and K(+)-dependent glutathione S-transferases which confer fosfomycin resistance in Gram-negative bacteria by conjugation of glutathione to the antibiotic. Plasmid-borne fosA variants have been reported in fosfomycin-resistant Escherichia coli strains. However, the prevalence and distribution of fosA in other Gram-negative bacteria are not known...
August 29, 2017: MBio
https://www.readbyqxmd.com/read/28851296/design-and-rationale-of-the-procalcitonin-antibiotic-consensus-trial-proact-a-multicenter-randomized-trial-of-procalcitonin-antibiotic-guidance-in-lower-respiratory-tract-infection
#17
David T Huang, Derek C Angus, Chung-Chou H Chang, Yohei Doi, Michael J Fine, John A Kellum, Octavia M Peck-Palmer, Francis Pike, Lisa A Weissfeld, Jonathan Yabes, Donald M Yealy
BACKGROUND: Overuse of antibiotics is a major public health problem, contributing to growing antibiotic resistance. Procalcitonin has been reported to be commonly elevated in bacterial, but not viral infection. Multiple European trials found procalcitonin-guided care reduced antibiotic use in lower respiratory tract infection, with no apparent harm. However, applicability to US practice is limited due to trial design features impractical in the US, between-country differences, and residual safety concerns...
August 29, 2017: BMC Emergency Medicine
https://www.readbyqxmd.com/read/28796408/use-of-the-anion-gap-and-intermittent-hemodialysis-following-continuous-hemodiafiltration-in-extremely-high-dose-acute-on-chronic-lithium-poisoning-a-case-report
#18
Yohei Komaru, Ryota Inokuchi, Yoshihiro Ueda, Masaomi Nangaku, Kent Doi
A 35-year-old woman intentionally took 40,000 mg of lithium carbonate, and she was transferred to our hospital with nausea, vomiting, and diarrhea. She was diagnosed as having bipolar disorder 10 years ago and was receiving oral lithium therapy. Blood test results on arrival were remarkable for a negative anion gap of -2.1 and later, the serum lithium level turned out to be as high as 15.4 mEq/L. Intubation was required because of disrupted consciousness, and continuous hemodiafiltration (CHDF) was immediately started in the intensive care unit to obtain constant removal of lithium...
August 10, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28782704/geographical-variation-in-therapy-for-bloodstream-infections-due-to-multidrug-resistant-enterobacteriaceae-a-post-hoc-analysis-of-the-increment-study
#19
Patrick N A Harris, M Diletta Pezzani, Belén Gutiérrez-Gutiérrez, Pierluigi Viale, Po-Ren Hsueh, Patricia Ruiz-Garbajosa, Mario Venditti, Mario Tumbarello, Carolina Navarro-Francisco, Esther Calbo, Murat Akova, Helen Giamarellou, Antonio Oliver, Benito Almirante, Oriol Gasch, Luis Martínez-Martínez, Mitchell J Schwaber, George Daikos, Johann Pitout, Carmen Peña, Alicia Hernández-Torres, Yohei Doi, Federico Pérez, Felipe Francisco Tuon, Evelina Tacconelli, Yehuda Carmeli, Robert A Bonomo, Álvaro Pascual, David L Paterson, Jesús Rodríguez-Baño
We describe regional differences in therapy for bloodstream infection (BSI) caused by extended-spectrum β-lactamase-producing Enterobacteriaceae (ESBL-E) or carbapenemase-producing Enterobacteriaceae (CPE). Patients (n = 1482) in 12 countries from an observational study of BSI caused by ESBL-E or CPE were included. Multivariate logistic regression was used to calculate adjusted odds ratios (aORs) for the influence of country of recruitment on empirical use of β-lactam/β-lactamase inhibitors (BLBLIs) or carbapenems, targeted use of BLBLIs for ESBL-E and use of targeted combination therapy for CPE...
August 3, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28743946/identification-of-the-eskape-pathogens-by-mass-spectrometric-analysis-of-microbial-membrane-glycolipids
#20
Lisa M Leung, William E Fondrie, Yohei Doi, J Kristie Johnson, Dudley K Strickland, Robert K Ernst, David R Goodlett
Rapid diagnostics that enable identification of infectious agents improve patient outcomes, antimicrobial stewardship, and length of hospital stay. Current methods for pathogen detection in the clinical laboratory include biological culture, nucleic acid amplification, ribosomal protein characterization, and genome sequencing. Pathogen identification from single colonies by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) analysis of high abundance proteins is gaining popularity in clinical laboratories...
July 25, 2017: Scientific Reports
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